Mark Ruffalo snapped a few shots of the situation at Pinewood Studios, including a shot of Scarlett Johansson being appropriately mysterious as Black Widow — is she boxing in this new film? — and a selfie with science partner and yin to his yang, Robert Downey Jr.

Ruffalo seems to have gotten into a little bit of hot water with Marvel for sharing these photos; soon after posting the initial pics, he tweeted, “I’m sorry @marvel. I will be better. I’m like your black sheep Avenger” and then went back to his usual steady stream of environmental tweets.